Elevation data Larvik 10pkt 2010

Elevation data provides a detailed description of terrain and surface. The data are established as point clouds from airborne laser scanning or matching from aerial images. The point clouds have varying density (point/m²) for different purposes.
From the point clouds, elevation models are generated on grid format of terrain (DTM) and surface (DOM).

高程数据可对地形与地表进行精细化描述。该类数据可通过机载激光扫描（airborne laser scanning）获取点云，或通过航空影像匹配生成点云。针对不同应用需求，此类点云的点密度（单位：点/平方米）存在差异。基于上述点云，可生成栅格格式的地形高程模型（DTM，Digital Terrain Model）与地表高程模型（DOM，Digital Surface Model）。